What is the ruling on preaching to people at the grave when the deceased is being buried?

Question:
May Allah reward you, Honorable Shaykh. He says: What is the ruling on the sermon? What is the ruling on a sermon at the grave after the body is placed in the grave, to preach to the people?

Answer:
This is something the Messenger (peace and blessings be upon him) did not do except once for a reason. He did it once for a reason, which was that when they brought the deceased, they found that the grave had not yet been prepared. So the Prophet (peace and blessings be upon him) sat down, and his Companions sat around him waiting for the grave to be prepared, and he (peace and blessings be upon him) preached to them. This is the reason. As for when they arrive and the grave is prepared and everything is finished, they bury the deceased, stand at his grave after the burial, make du'a for him, and seek forgiveness for him, then they leave. This is the Sunnah of the Messenger (peace and blessings be upon him). As for making preaching at the graves a permanent practice, and making this a continuing religious law, this is a great error. So this action is not permissible. Yes.